<!DOCTYPE html>
<html>
<head>
	<title>Javascript + DOM</title>
	<link rel="stylesheet" type="text/css" href="style.css">
  <style>
    *{
			margin: 0;
			padding: 0;
		}
    /* <!--> 
    .box {
      width:300px;
      height:50px;
      border: 10px solid red;
      margin: 20px auto;
      }*/
  
    .box {
      width:200px;
      height:200px;
      position: absolute;
      left: 50%;
      margin-left:-110px;
      top: 20px;
      border: 10px solid red;
    }
  
  </style>
</head>
<body>

<div class="box">

</div>

	<script type="text/javascript" src="app.js"></script>
</body>
</html>